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Consolidated Condensed Statements of Stockholders Equity (Unaudited) (USD $)
In Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Noncontrolling Interest [Member]
Total
Balance at Dec. 31, 2011 $ 330 $ 80,078 $ 237,762 $ 2,189 $ 320,359
Balance (in Shares) at Dec. 31, 2011 32,977        
Net income     19,548   19,548
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards 1 615     616
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 130        
Tax benefits from share-based payment arrangement exercises   350     350
Share-based payment arrangement compensation expense   1,047     1,047
Dividends on common stock     (1,545)   (1,545)
Income before income taxes attributable to noncontrolling interest       467 467
Noncontrolling interest distributions       (230) (230)
Balance at Sep. 30, 2012 331 82,090 255,765 2,426 340,612
Balance (in Shares) at Sep. 30, 2012 33,107        
Net income     7,719   7,719
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards 1 352 (1)   352
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 57        
Tax benefits from share-based payment arrangement exercises   59     59
Share-based payment arrangement compensation expense   178     178
Dividends on common stock     (17,134)   (17,134)
Income before income taxes attributable to noncontrolling interest       30 30
Noncontrolling interest distributions       107 107
Balance at Dec. 31, 2012 332 82,679 246,349 2,563 331,923
Balance (in Shares) at Dec. 31, 2012 33,164        
Net income     22,846   22,846
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards   282     282
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 66        
Tax benefits from share-based payment arrangement exercises   146     146
Share-based payment arrangement compensation expense   862     862
Dividends on common stock     (1,937)   (1,937)
Income before income taxes attributable to noncontrolling interest       84 84
Noncontrolling interest distributions       (84) (84)
Change to equity method of accounting       (2,563) (2,563)
Balance at Sep. 30, 2013 $ 332 $ 83,969 $ 267,258   $ 351,559
Balance (in Shares) at Sep. 30, 2013 33,230